Flame retarded mechanism of intumescent flame retardants

Flame retarded mechanism of intumescent flame retardants
Preniphor™ EPFR-100 series function in condensed phase.
At lower temperature, acid source generates acid acts as dehydrant to esterify polyol (carbon source).
At high temperature, esterification happens between acid and polyol. Meanwhile, amine in the system catalyzes and fastens the esterification. And the substrate melts during this period.
Water gases and incombustible gases produced by reaction swell the melt substrate. And polyol and ester dehydrate and carbonize to form inorganic materials and char, which protects the substrate from heat and oxygen to inhibit further burning.

Advantages

Low loading (28-32 wt%)

Excellent performance in processing

Good mechanical properties 

Good color stability

Halogen free and eco-friendly

High flame retarding efficiency（UL 94 V-0 0.75mm）